Is there any way to 'recover' RAM usage (other than restarting)?

Hi everyone,
I just upgraded my White Macbook 4,1 to 4GB of RAM and when I first boot the system, Activity Monitor shows that over 3GB is free.
After several hours of usage (Mail, Safari 4 Beta, iTunes, iCal, iPhoto, Time Machine, Address Book, and yes...Activity Monitor!) it shows just over 2GB free.
Now the part that puzzles me is that even after quitting all these applications, the RAM usage does recover somewhat, but never reaches it's original >3GB of availability.
A reboot certainly does the job. But is there any other way that Leopard can recover this memory? Is this normal? If I simply leave the system idle for some time without any open applications will Leopard eventually reclaim the lost memory?
Thanks!
Message was edited by: Michael271

There's no need for any "ram" recovery. It's all handled by the memory manager. You must be coming from the world of XP. See the following:
About OS X Memory Management and Usage
Reading system memory usage in Activity Monitor
Memory Management in Mac OS X
Performance Guidelines- Memory Management in Mac OS X
A detailed look at memory usage in OS X
Understanding top output in the Terminal
The amount of available RAM for applications is the sum of Free RAM and Inactive RAM. This will change as applications are opened and closed or change from active to inactive status. The Swap figure represents an estimate of the total amount of swap space required for VM if used, but does not necessarily indicate the actual size of the existing swap file. If you are really in need of more RAM that would be indicated by how frequently the system uses VM. If you open the Terminal and run the top command at the prompt you will find information reported on Pageins () and Pageouts (). Pageouts () is the important figure. If the value in the parentheses is 0 (zero) then OS X is not making instantaneous use of VM which means you have adequate physical RAM for the system with the applications you have loaded. If the figure in parentheses is running positive and your hard drive is constantly being used (thrashing) then you need more physical RAM.

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